Preparation system and method of spatial separation storage unit based on microlens array

Abstract

The invention discloses a preparation system and method of a spatial separation storage unit based on a microlens array, and relates to the field of quantum storage, and the method comprises the steps: a multi-beam generation module is used for generating initial continuous laser, and obtaining multiple beams of independent pulse laser based on the initial continuous laser; the light beam arrangement module is used for arranging multiple beams of independent pulse laser into a parallel light beam array; the micro-lens array module comprises a plurality of sub-lenses with the same focal length, the number of the sub-lenses is consistent with the number of light beams of the parallel light beam array, and each light beam in the parallel light beam array enters along the optical axis of the corresponding sub-lens and is focused to different spatial positions of the cold atomic group to form a plurality of spatial separation storage units; therefore, each path of light beam in the parallel light beam array strictly enters along the optical axis of the corresponding sub-lens and is focused to mutually isolated spatial positions in the cold atomic group, a plurality of spatially separated independent storage units are prepared, and crosstalk between modes is avoided.

Description

Technical Field

[0001] This application relates to the field of quantum storage, and in particular to a system and method for fabricating spatially separated storage cells based on microlens arrays. Background Technology

[0002] Quantum memories are core components of quantum sensing networks, distributed quantum computing, and quantum repeaters. Atom-ensemble-based quantum memories facilitate strong coupling between atoms and photons due to collective excitation. However, single-ensemble-based storage schemes have limitations in parallel processing of quantum information and entanglement purification, hindering their application in practical quantum networks. In recent years, spatially separated storage units—dividing a macroscopic cluster of cold atoms into multiple spatially separated, independent, addressable sub-storage units—have offered a new approach to addressing these issues.

[0003] The DLCZ scheme represents a potential approach for quantum storage. In this scheme, a weak beam of write light excites atoms, which then emit photons through spontaneous Raman scattering, storing the corresponding spin waves within the atoms. Within this framework, current technologies primarily employ acousto-optic deflectors (AODs) to achieve multimode storage. Specifically, there are two approaches: one involves using the AOD to control the write light to sequentially scan different positions within the atomic cloud, thereby exciting independently addressable, spatially separated storage cells; the other involves simultaneously applying two frequencies to the AOD to store two spin waves in parallel within the atoms.

[0004] However, AOD applies different frequency shifts to photons of different spatial modes. When multiple different acoustic frequencies are simultaneously applied to AOD, additional frequencies are generated due to frequency intermodulation, which causes crosstalk between the generated diffracted beams. This can cause the signal of one mode to "leak" into the channel of another mode, directly reducing the fidelity of storage. Moreover, AOD has problems such as slow switching speed, frequency mismatch, and mode-efficiency trade-offs, which limit its application in practical quantum networks. Summary of the Invention

[0005] The purpose of this application is to provide a system and method for fabricating spatially separated memory cells based on microlens arrays, which can solve the problems mentioned above, such as "inter-mode crosstalk, slow switching speed and frequency mismatch".

[0006] To achieve the above objectives, this application provides the following solution: In a first aspect, this application provides a fabrication system for spatially separated memory cells based on a microlens array, comprising: A multi-beam generation module is used to generate an initial continuous laser beam and obtain multiple independent pulsed laser beams based on the initial continuous laser beam; A beam alignment module is used to arrange multiple independent pulsed laser beams into a parallel beam array, wherein the multiple beams in the parallel beam array are independent of each other and parallel. The microlens array module includes multiple sub-lenses with the same focal length. The number of sub-lenses is consistent with the number of beams in the parallel beam array. Each beam in the parallel beam array is incident along the optical axis of the corresponding sub-lens and focused to different spatial positions of the cold atom cluster to form multiple spatially separated storage units.

[0007] In one embodiment, the multi-beam generation module includes: Laser, used to provide an initial continuous laser beam; A beam splitter is used to split the initial continuous laser into multiple sub-lasers; Multiple driving circuits, the number of which is the same as the number of sub-lasers; Multiple acousto-optic modulators, each connected to a corresponding driving circuit, are used to independently switch and modulate the corresponding sub-laser to generate multiple independent pulsed laser beams.

[0008] In one embodiment, the beam alignment module includes: Multiple fiber-coupled transmission components are provided, the number of which is the same as the number of pulsed lasers. Each fiber-coupled transmission component includes a first fiber-coupled device, a second fiber-coupled device, and a single-mode fiber connected between the first fiber-coupled device and the second fiber-coupled device. Each laser pulse is collimated sequentially through the corresponding first fiber-coupled device, the single-mode fiber, and the second fiber-coupled device. A beam guide assembly is used to guide the collimated multi-path pulsed laser to a preset spatial position to form a parallel beam array.

[0009] In one embodiment, the system further includes a beam adjustment module disposed in the optical path between the beam alignment module and the microlens array module; The beam adjustment module is used to receive the parallel beam array and adjust the spot size of multiple parallel beams in the parallel beam array as well as the spacing between each beam.

[0010] In one embodiment, the beam adjustment module employs a telescope structure.

[0011] In one embodiment, the plurality of said sub-lenses are fixed together by adhesive bonding to form an integrated array structure.

[0012] Secondly, this application also provides a method for fabricating spatially separated memory cells based on a microlens array, comprising: An initial continuous laser beam is generated, and multiple independent pulsed laser beams are obtained based on the initial continuous laser beam; Multiple independent pulsed laser beams are arranged into a parallel beam array, wherein the multiple beams in the parallel beam array are independent of each other and parallel. A microlens array module is provided, wherein the microlens array module includes multiple sub-lenses with the same focal length, and the number of the sub-lenses is consistent with the number of beams in the parallel beam array; Each beam in the parallel beam array is incident along the optical axis of the corresponding sub-lens and focused to different spatial positions of the cold atom cluster to form multiple spatially separated storage units.

[0013] Thirdly, this application also provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method for fabricating a spatially separated storage cell based on a microlens array.

[0014] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described method for fabricating spatially separated storage cells based on a microlens array.

[0015] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method for preparing spatially separated memory cells based on microlens arrays.

[0016] According to the specific embodiments provided in this application, the following technical effects are disclosed: This application provides a fabrication system for spatially separated memory cells based on a microlens array. The system comprises a multi-beam generation module, a beam alignment module, and a microlens array module. The multi-beam generation module generates multiple independent pulsed laser beams based on an initial continuous laser beam. The beam alignment module arranges these independent pulsed laser beams into a parallel beam array. The microlens array module includes multiple sub-lenses with the same focal length, the number of which matches the number of beams in the parallel beam array. Each beam in the parallel beam array is incident along the optical axis of its corresponding sub-lens and focused to different spatial positions within the cold atom cluster, thus forming multiple spatially separated memory cells. This ensures that each beam in the parallel beam array is strictly incident along the optical axis of its corresponding sub-lens and focused to mutually isolated spatial positions within the cold atom cluster, fabricating multiple spatially separated and easily manipulated independent memory cells. All optical channels of the spatially separated storage unit in this application are determined by a microlens array and independent optical devices, and are independent of the frequency of the acousto-optic modulator. This eliminates inter-mode crosstalk caused by optical path spatial crossing or shared modulation devices, significantly improves the fidelity of multimode quantum storage and the reliability of parallel operation, increases read / write speed, and meets the requirements of high-speed, parallel processing of quantum information and provision of redundant backup for quantum memories. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a system block diagram of a fabrication system for a space-separated storage cell based on a microlens array according to an embodiment of this application; Figure 2 This is a schematic block diagram of a fabrication system for a space-separated memory cell based on a microlens array, according to an embodiment of this application. Figure 3 This is an optical thickness bar chart of four spatially separated memory cells during the experimental stage of a fabrication system for spatially separated memory cells based on a microlens array, according to an embodiment of this application. Figure 4 This is a flowchart illustrating a method for fabricating a spatially separated storage cell based on a microlens array according to an embodiment of this application. Figure 5 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] See Figure 1 This application provides a fabrication system for spatially separated storage units based on microlens arrays, including a multi-beam generation module, a beam alignment module, and a microlens array module.

[0022] In this embodiment of the application, the multi-beam generation module is used to generate an initial continuous laser and obtain multiple independent pulsed lasers based on the initial continuous laser.

[0023] Specifically, the multi-beam generation module includes a laser, a beam splitting component, multiple acousto-optic modulators, and multiple driving circuits. The laser is used to provide an initial continuous laser beam; the beam splitting component is used to divide the initial continuous laser beam into multiple sub-lasers; the number of driving circuits is the same as the number of sub-lasers; each acousto-optic modulator is connected to a corresponding driving circuit to independently switch and modulate the corresponding sub-laser to generate multiple independent pulsed laser beams.

[0024] For example, see Figure 2 The multi-beam generation module uses a laser (LD) as the core light source to generate an initial continuous laser beam. The beam splitting component can employ multiple beam splitters to divide the initial continuous laser output from the laser into multiple beams, each controlled by an acousto-optic modulator (AOM). In this application, all optical channels of the multiple spatially separated storage units are equipped with independent acousto-optic modulators, achieving switching times of tens of ns, thus improving read / write speeds and directly enhancing the entanglement generation rate and quantum communication efficiency of the quantum repeater link based on this storage unit.

[0025] To effectively drive the AOM (Atomic Oxide Mesh), the driving circuit consists of a radio frequency (RF) source, an RF switch, and a power amplifier connected in sequence. The RF source outputs a stable high-frequency RF signal (typically 200MHz), which is fed into the RF switch. The RF switch rapidly switches the RF signal according to a control command (an external TTL signal). The switched RF signal is then amplified by the power amplifier to obtain sufficient power (typically in the watt range) to effectively drive the piezoelectric transducer in the AOM. Inside the AOM, the amplified RF signal excites an acoustic field, forming a periodic refractive index grating that deflects the incident continuous laser light, converting it into pulsed laser light. Thus, by precisely controlling the timing of the RF switch, the system can output multiple independently controlled pulsed laser beams, providing crucial optical input conditions for the subsequent simultaneous fabrication of multiple spatially separated memory cells within the cold atom cluster.

[0026] In this embodiment, the beam alignment module is used to organize multiple independent pulsed laser beams into a parallel beam array, wherein the multiple beams in the parallel beam array are independent and parallel to each other. Thus, multiple independent but potentially spatially dispersed pulsed laser beams are organized into a regularly positioned and parallel beam array, providing an input light field that meets the optical design requirements for subsequent microlens arrays.

[0027] Specifically, the beam alignment module includes a light guide mirror group and multiple fiber optic coupling transmission components. The number of fiber optic coupling transmission components is the same as the number of pulsed lasers. Each fiber optic coupling transmission component includes a first fiber optic coupler, a second fiber optic coupler, and a single-mode fiber connecting the first fiber optic coupler and the second fiber optic coupler. Each laser pulse is collimated sequentially through the corresponding first fiber optic coupler, single-mode fiber, and second fiber optic coupler. The light guide mirror group is used to guide the collimated multi-path pulsed lasers to a preset spatial position to form a parallel beam array.

[0028] All optical channels in this application can be equipped with independent fiber optic coupling devices, enabling one-to-one correspondence between spatially separated storage units and optical channels. Changes in ambient temperature will not cause changes in the optical path, and the phase matching conditions in quantum storage will not be affected, thereby improving the conversion efficiency of atomic spin waves to photons in quantum memories.

[0029] See Figure 2 The light guide mirror assembly includes multiple light guide mirrors, each corresponding to a beam output from the fiber optic coupling transmission component. By independently adjusting the angle and orientation of each light guide mirror, multiple beams are guided to a specific spatial position, and the directions of all outgoing beams are kept parallel, resulting in a parallel beam array with multiple beams that are straight and parallel to each other.

[0030] In this embodiment, the microlens array module includes multiple sub-lenses with the same focal length. The number of sub-lenses is consistent with the number of beams in the parallel beam array. Each beam in the parallel beam array is incident along the optical axis of the corresponding sub-lens and focused to different spatial positions of the cold atom cluster to form multiple spatially separated storage units.

[0031] Multiple sub-lenses are fixed together to form an integrated array structure. Specifically, the sub-lenses are bonded together using high-precision optical adhesive, resulting in a robust integrated device with consistent optical performance. Furthermore, it is possible to replace microlens arrays with different focal lengths to change the spot size of each parallel beam in the spatial position of the cold atom cluster. This makes the spot size much smaller than the distance between beams, reducing crosstalk between modes and improving the fidelity of the quantum memory.

[0032] In this embodiment of the application, the system further includes a beam adjustment module, which is disposed in the optical path between the beam alignment module and the microlens array module; the beam adjustment module is used to receive the parallel beam array and adjust the spot size of the multiple parallel beams in the parallel beam array and the spacing between each beam.

[0033] The beam adjustment module employs a telescope structure to expand or contract the beam. For example, the telescope structure consists of a plano-concave lens (negative focal length) and a plano-convex lens (positive focal length). The distance between the two lenses is the sum of their focal lengths. By changing the focal length of either lens, the diameter of multiple beams in the parallel beam array emitted from the beam arrangement module and the distance between them can be freely adjusted.

[0034] This application uses a microlens array as the core to establish multiple independent optical channels. All optical channels are equipped with independent fiber optic coupling devices and acousto-optic modulators, which solves the problems of slow AOD switching speed, frequency mismatch and mode crosstalk. This provides a new method to improve the parallel storage capability of multimode quantum memories and increase the success rate of quantum repeaters.

[0035] In the experimental verification section, the independence of the performance of each spatially separated memory cell is visually demonstrated by measuring key performance parameters (such as optical thickness) of multiple spatially separated memory cells. In a specific example, the optical thickness of four spatially separated memory cells was measured using a weak light absorption method. Four write laser beams with power much lower than the saturation light intensity passed through the atom along its long axis. The transmission spectrum of the write laser was obtained by scanning its frequency near the atomic transition frequency. This transmission spectrum was then used to infer the optical thickness of the spatially separated memory cells it passed through. Optical thickness is a key parameter for measuring the efficiency of quantum memories and reflects the storage potential of spatially separated memory cells. See also... Figure 3With the center of the atom as the origin of the coordinate system, an xy plane is established perpendicular to the long axis of the atom. The positions of the four spatial beams are (0.7mm, 0.7mm), (0.7mm, -0.7mm), (-0.7mm, 0.7mm), and (-0.7mm, -0.7mm), respectively, which correspond to storage units (modes) 1, 2, 3, and 4. Their respective optical thicknesses are shown in the figure.

[0036] Based on the same inventive concept, this application also provides a method for fabricating a spatially separated memory cell based on a microlens array. The solution provided by this method is similar to the solution described above. Therefore, the specific limitations of one or more embodiments of the method for fabricating a spatially separated memory cell based on a microlens array provided below can be found in the limitations of the fabrication system for the spatially separated memory cell based on a microlens array described above, and will not be repeated here.

[0037] See Figure 4 This application provides a method for fabricating spatially separated memory cells based on microlens arrays, the steps of which are as follows: S100: Generates an initial continuous laser beam and obtains multiple independent pulsed laser beams based on the initial continuous laser beam; S200: Multiple independent pulsed laser beams are arranged into a parallel beam array, in which the multiple beams are independent and parallel to each other. S300: A microlens array module is provided, wherein the microlens array module includes multiple sub-lenses with the same focal length, and the number of sub-lenses is consistent with the number of beams in the parallel beam array. S400: Each beam in the parallel beam array is incident along the optical axis of the corresponding sub-lens and focused to different spatial positions of the cold atom cluster to form multiple spatially separated storage units.

[0038] In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 5As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and databases. The internal memory provides the environment for the operating system and computer programs stored in the non-volatile storage media to run. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network connection.

[0039] Those skilled in the art will understand that Figure 5 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0040] In one exemplary embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0041] In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0042] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0043] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0044] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0045] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A fabrication system for spatially separated storage cells based on a microlens array, characterized in that, include: A multi-beam generation module is used to generate an initial continuous laser beam and obtain multiple independent pulsed laser beams based on the initial continuous laser beam; A beam alignment module is used to arrange multiple independent pulsed laser beams into a parallel beam array, wherein the multiple beams in the parallel beam array are independent of each other and parallel. The microlens array module includes multiple sub-lenses with the same focal length. The number of sub-lenses is consistent with the number of beams in the parallel beam array. Each beam in the parallel beam array is incident along the optical axis of the corresponding sub-lens and focused to different spatial positions of the cold atom cluster to form multiple spatially separated storage units.

2. The fabrication system for spatially separated storage units based on microlens arrays according to claim 1, characterized in that, The multi-beam generation module includes: Laser, used to provide an initial continuous laser beam; A beam splitter is used to split the initial continuous laser into multiple sub-lasers; Multiple driving circuits, the number of which is the same as the number of sub-lasers; Multiple acousto-optic modulators, each connected to a corresponding driving circuit, are used to independently switch and modulate the corresponding sub-laser to generate multiple independent pulsed laser beams.

3. The fabrication system for spatially separated storage units based on microlens arrays according to claim 1, characterized in that, The beam alignment module includes: Multiple fiber-coupled transmission components are provided, the number of which is the same as the number of pulsed lasers. Each fiber-coupled transmission component includes a first fiber-coupled device, a second fiber-coupled device, and a single-mode fiber connected between the first fiber-coupled device and the second fiber-coupled device. Each laser pulse is collimated sequentially through the corresponding first fiber-coupled device, the single-mode fiber, and the second fiber-coupled device. A beam guide assembly is used to guide the collimated multi-path pulsed laser to a preset spatial position to form a parallel beam array.

4. The fabrication system for spatially separated storage units based on microlens arrays according to claim 1, characterized in that, The system also includes a beam adjustment module, which is disposed in the optical path between the beam alignment module and the microlens array module; The beam adjustment module is used to receive the parallel beam array and adjust the spot size of multiple parallel beams in the parallel beam array as well as the spacing between each beam.

5. The fabrication system for spatially separated storage units based on microlens arrays according to claim 4, characterized in that, The beam adjustment module adopts a telescope structure.

6. The fabrication system for spatially separated storage cells based on microlens arrays according to claim 1, characterized in that, Multiple sub-lenses are fixed together by adhesive bonding to form an integrated array structure.

7. A method for fabricating a spatially separated storage cell based on a microlens array, characterized in that, include: An initial continuous laser beam is generated, and multiple independent pulsed laser beams are obtained based on the initial continuous laser beam; Multiple independent pulsed laser beams are arranged into a parallel beam array, wherein the multiple beams in the parallel beam array are independent of each other and parallel. A microlens array module is provided, wherein the microlens array module includes multiple sub-lenses with the same focal length, and the number of the sub-lenses is consistent with the number of beams in the parallel beam array; Each beam in the parallel beam array is incident along the optical axis of the corresponding sub-lens and focused to different spatial positions of the cold atom cluster to form multiple spatially separated storage units.

8. A computer device, comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that the processor executes the computer program to implement the method for fabricating a spatially separated memory cell based on a microlens array as described in any one of claims 1-7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the method for fabricating a spatially separated storage cell based on a microlens array as described in any one of claims 1-7.

10. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the method for fabricating a spatially separated storage cell based on a microlens array as described in any one of claims 1-7.

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